In the field of spintronics electrical currents can be used to control the magnetic properties of materials. In our project, we explored the spin-orbit torques (SOTs) induced by these currents to manipulate magnetic structures without relying on external magnetic fields. We focused on a combination of SOTs and another effect known as the interfacial Dzyaloshinskii-Moriya interaction (iDMI), which creates unique magnetic textures like chiral domain walls and skyrmions. Our goal was to use these effects to build viable fully electrically controlled, fast, ultra-low power operation, spin-current-driven chiral magnetic domain wall transistor devices. We designed ultrathin magnetic structures and used various experimental techinques to understand their properties, like second harmonic Hall experiments and Brillouin light spectroscopy and Kerr effect microscopy.

Cognitive impact. The project advances fundamental understanding of current-induced spin-orbit torques and their interplay with interfacial Dzyaloshinskii–Moriya interaction in ultrathin magnetic heterostructures. By combining second-harmonic Hall measurements, Brillouin light scattering, and magneto-optic Kerr effect microscopy, it establishes reliable experimental approaches for the characterization and control of chiral magnetic domain walls. These results strengthen the physical framework underpinning fully electrically controlled, low-power spintronic devices beyond the CMOS paradigm. Socio-economic impact. By addressing energy consumption and power dissipation in information technologies, the project contributes to the development of ultra-low-power, non-volatile computing architectures. The demonstrated concepts are relevant for future applications in energy-efficient electronics, IoT, and neuromorphic computing, while supporting advanced training in nanofabrication and characterization techniques. In the long term, the results provide a basis for potential technology transfer and innovation in spintronic devices.

Published papers:

Geometry-Controlled Asymmetric Diode and Routing Functionalities in Spin-Orbit Torque Driven Domain Wall Devices, EM Stetco, T Petrisor, O Pop, IM Miron, MS Gabor,  Joint European Magnetic Symposia 2025, Frankfurt, Germany